|Publication number||US6978988 B2|
|Application number||US 10/152,704|
|Publication date||Dec 27, 2005|
|Filing date||May 20, 2002|
|Priority date||Oct 26, 1999|
|Also published as||CA2324738A1, CA2324738C, US6241228, US6390460, US20010028138, US20020175459|
|Publication number||10152704, 152704, US 6978988 B2, US 6978988B2, US-B2-6978988, US6978988 B2, US6978988B2|
|Original Assignee||Charles Chupick|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (53), Referenced by (3), Classifications (10), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation application of Ser. No. 09/851,061 entitled FREE-FLOATING HYDRAULIC CLAMPING DEVICE WITH EDGE-GRIPPING ARBOR filed May 8, 2001, now U.S. Pat. No. 6,390,460, which is a continuation-in-part of U.S. patent application Ser. No. 09/426,597 entitled FREE-FLOATING HYDRAULIC CLAMPING DEVICE WITH EDGE-GRIPPING ARBOR, now U.S. Pat. No. 6,241,228 issued Jun. 5, 2001, the entire specifications of which are expressly incorporated herein by reference.
The present invention relates to a workholder for securing a work piece and, more particularly, to an expandable arbor for securing a work piece which engages an outside edge of the internal diameter of the bore in the work piece.
In conventional manufacturing, work pieces typically are secured to a surface or fixture to allow cutting elements, such as mills, to accurately remove material from the work piece and shape the work piece into a final product. Various support platforms, such as work benches, are suitable to serve as the support platform. The support platform serves to provide a solid base against which the cutting element may apply pressure to the work piece and also provides a foundation for dimensional consistency. To secure the work piece to the support platform, clamping devices are employed which extend from the support platform, around a side of the work piece and apply pressure to an upper surface of the work piece opposite the support platform. As a result, the clamp presses the work piece against the support platform to allow the cutting elements to proceed in machining areas of the work piece which are not obstructed by the clamping element.
While this clamping method effectively secures the work piece to the support platform, the positioning of the clamps often obstructs the cutting elements access to the work piece and thereby renders machining difficult. As a result, the work piece must be continuously unclamped and reclamped in different areas to allow access to the previously obstructed areas. This causes increased manufacturing cost and time. The present invention was developed to overcome these concerns.
It is, therefore, an object of the present invention to provide a workholder which utilizes an expandable arbor to engage bores contained within the work piece, thereby maximizing the amount of access the cutting element has to the work piece.
It is yet another object of the present invention to provide a workholder which utilizes an expandable arbor to engage bores contained within the work piece, which first clamps the bores and then draws the work piece against a support platform.
It is still another object of the present invention to provide a workholder which utilizes an expandable arbor to engage bores contained within the work piece, wherein the amount of expansion force generated by the expandable arbor on the bores is variable.
It is still another object of the present invention to provide a workholder which utilizes an expandable arbor to engage bores contained within the work piece, which allows adjustment for varying hole positioning on the work piece.
To accomplish these and other objects, the present invention provides a workholder for securing a work piece by engaging at least one bore contained in the work piece and locating on a second bore of the work piece. The workholder includes a support platform, bore clamping device, and a locator assembly. The bore clamping device is mounted to the support platform and has a cylindrical, expandable arbor extending upwardly from the support platform for positioning in and engaging the bore. The locator assembly has a locator pin extending upwardly from the support platform for positioning within and locating the second bore.
In another aspect of the present inventor, a workholder for securing a work piece by engaging a plurality of bores contained in the work piece which includes a support platform and a plurality of bore clamping devices mounted to the support platform. Each bore clamping device has a cylindrical, expandable arbor extending upward from the support platform for engaging one of the bores.
Another aspect of the present invention includes an expandable arbor having a cap that spreads out to engage the work piece upper surface prior to a force exerting downward on and clamping the work piece.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Referring now to
Referring now to
Referring now to
Referring now to
Referring now to
Referring again to
Referring now to
It is noted that in the clamped position, first portion 48 and transition point 54 are no longer adjacent to inner diameter 92 of passage 88. Instead, the smaller diameter in the second portion 56 is proximate inner diameter 92. Because of this smaller diameter, cylindrical region 82 is no longer providing support to cylindrical expandable arbor 38. This allows cylindrical expandable arbor 38 to flex and accommodate for any variations in the location of bores in the work piece 112.
Referring now to
Referring now to
Referring now to
The wedge 216 is similar in design to the wedge 46 disclosed in
With reference to
The clamping device 300 further has an elevated support pad 40 for clamping the work piece 112 against, a fixture base 14, a hydraulic cylinder block 312 connected by bolts 314 to the support pad 40 and the fixture base 14, and an end cap 316. A plurality of bolts 318 extend vertically through the end cap 316 and are connected to the hydraulic cylinder block 312. A floating piston 320 moves within cavity 322 which is in turn defined by internal walls of the hydraulic cylinder block 312 and the end cap 316. The double acting piston 320 is hydraulically actuated and a first hydraulic pressure line 324 provides inlet pressure for a clamp mode of operation. A second hydraulic high pressure line 326 provides hydraulic fluid to cavity 322 during the unclamping mode of operation. The piston 320 includes grooves 328 for receiving seals 330 for creating a tight connection between the piston 320 and inner wall 332 of the cavity 322. The piston 320 further includes an internally threaded bore 334 extending the entire longitudinal length of the piston and is operable to receive screw 336 that is concentric with and is secured to the lower end of arbor 302. A nut 338 is threaded to the lower end of the screw 336 and provides for axial adjustment of the arbor.
The clamping device 300 further includes spacers 340 and 342 located at distal ends of the spring 344. The springs 344 provide for axial dampening of the arbor 302 as it is drawn downward for engagement with the work piece 112. A seal 346 is positioned within the support pad 340 and engages the outer diameter 348 of the arbor 302 and prevents metal shavings from further working down into the clamping device 300.
With reference to
Once the work piece 112 is machined, hydraulic line 326 is pressurized causing piston 320 to move upwardly thus allowing wedge 216 to retract within a slot 208 which, in turn, allows the split edge gripping member 410 to close and disengage from the work piece 112. The work piece can now be lifted off of the clamping device 400 wherein the method of machining can be repeated.
It will be appreciated that other variations of the free floating hydraulic clamping device utilizing an edge gripping arbor can be utilized.
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention. Such variations or modifications, as would be obvious to one skilled in the art, are intended to be included within the scope of the following claims.
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|US8448929 *||Jul 25, 2008||May 28, 2013||Lisi Aerospace||Riveting screw tack and use thereof for temporarily fixing a boring grid to elements to be assembled|
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|U.S. Classification||269/48.1, 29/252|
|International Classification||B23Q1/00, B23Q3/14|
|Cooperative Classification||Y10T29/53878, B23Q3/14, Y10T29/5383, B23Q1/009|
|European Classification||B23Q1/00D3A, B23Q3/14|
|Jul 12, 2006||AS||Assignment|
Owner name: INNOVATIVE TECHNOLOGIES UNLIMITED LLC, MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHUPICK, CHARLES;REEL/FRAME:017914/0661
Effective date: 20060126
|Jul 6, 2009||REMI||Maintenance fee reminder mailed|
|Dec 27, 2009||LAPS||Lapse for failure to pay maintenance fees|
|Feb 16, 2010||FP||Expired due to failure to pay maintenance fee|
Effective date: 20091227